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This March 22, 2017, file photo shows police officers standing guard outside the Palace of Westminster in central London during an emergency incident.

A man was arrested on suspicion of possessing a knife near British Parliament Friday, London police said, after a large police response in the heart of the nation's capital.

The incident took place before noon, local time, a London Metropolitan Police representative told NBC News. No one was injured.

Other details weren't immediately available.

The arrest comes with the nation on alert after a series of deadly attacks. In March, a man drove into pedestrians on nearby Westminster Bridge and stormed a gate at Parliament before he was shot dead. Since then, a suicide bomber attacked a concert in Manchester and several attackers left people dead on and near London Bridge in a vehicle-and-knife rampage.

London Investigates Terrorist Incident

Police in London responded to what officials are calling a terrorist incident outside Parliament on March 22.